The story at NASA ended at the end of season 2, it was good. I was excited to see this polaris thing and thought a new generation of characters will be here with new and cool adventures, but nope it's just a bunch of old NASA people being pathetic. Also who cares about which country goes to mars first when you can make a ton of money with sapce tourism.
The design of the space station is pretty bad, the science is inaccurate, the computer interface they use is inefficient, but i dont care much anymore because things are going crazier and crazier since season 2 and logic is out the window. I get that you need to create dangerous situations to make people excited. Viewed as a dumb adventure show with space technology it's alright. Just don't think too much about the plot or science and you'll be ok.